me, michaela, is that 1:19 when 370 says good night, 370, the kuala lumpur, and ho chi minh and 120 decimal 9 is expecting that call. >> sure. >> now, we know on this timeline that at 1:38, which is 17 minutes or around 17 minutes after that, that handover, ho chi minh are going, kuala lumpur, we've not heard from 370. that's 17 minutes. that's a long time. why 30 minutes? it's all to do with search and rescue procedure. okay? so if we draw a line, a radius line out from that last noin known point and it's 30 minutes and the aircraft is traveling around 300 knots, that's about 150 miles. okay? that's 150-mile radius. on a search circle, that would be an area of around 70,000 square miles. okay? just to give you an indication, if it's five hours, that's 1500 miles. that circle goes to over 7 million square miles.